Other Functions - Epson S1F76680 Technical Manual

Description of the registers
• Address
Register name X3, X2, X1, X0
Register name NLED
Register name SEN2
Register name SRESET
• Address
Register name
• Address
Register name
• Address
Register name

7.5 Other functions

• Soft start function
S1F76680 is built in with the soft start function that prevents incoming current.
After power on of V
Even if it causes no problem to power on EN2 and EN3 after soft start, nonetheless, LED starts to light up
after soft start.
• Charge pump function
S1F76680 is equipped with a charge pump type DC/DC converter, which generates necessary voltage to
light up LED from voltage supplied to V
This charge pump circuit operates while selecting the booster magnification from 1.5 and 1 times
according to necessity, thus, provides a longer operating time to battery-operated devices.
To operate this circuit, pump-up capacitor C1 and C2, and storage capacitor CV
S1F76680 Technical Manual (Rev.1.22)
Downloaded from Elcodis.com electronic components distributor
7. OPERATIONAL AND FUNCTIONAL DESCRIPTION
00H
: 4-bit read-only brightness information. X3=MSB, X0=LSB.
Brightness information can only be read under the condition of EN2=1
or SEN2=1.
Also, it is possible to read brightness information regardless of
whether the imperative fixed current drive register is set to NLED=0
or NLED=1.
: Register for imperative fixed current drive setting.
NLED=1
NLED=0
: Register for automatic luminance control operation setting.
SEN2=1
SEN2=0
* Automatic luminance control is enabled if either this register SEN2 or EN2 pin is set
to "1."
: Register for I
SRESET=1
SRESET=0
2
* I C will be reset when SRESET=1 or RESET pin=0.
To exit reset, write as SRESET=0.
SRESET=0 can be written immediately after reset.
01H
ILED6 to ILED0
Registers for imperative fixed current setting.
02H to 11H
Y00 to YF6
Registers to set the current values for brightness 1 to 16 for auto luminance control.
1AH
TDW3 to TDW0, TUP3 to TUP0
They are the registers used for selecting LED current change time.
and V voltage and that of EN1, soft start is carried out for 3msec.
DD1 DD2
Enable driving at imperative fixed current value.
Default value.
Enable driving with automatic luminance control.
Default value.
2
C soft reset.
Executes soft reset.
Default value.
pin, and supplies it to V
DD1 OUT
EPSON
pin.
are required.
OUT
19